check age. Supposed to be changed every 10 years

来源: RomaVacation 于 2025-02-25 10:10:56 [] [旧帖] [给我悄悄话] 阅读数 : (194 bytes)
回答: 在线急问 由 安小爱 于 2025-02-25 09:09:50

Might change them all if you don't know history or could not find out age easily. 

It is supposed to chirp when battery voltage drops low. 

 

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